Gst rate and Sac/hsn

Sir
What is the rate and sac/hsn code for the following
1) Mobile accessories. Ie handfree charger etc
2) commission earn on Railway ticket book by agent of Irctc
3) commission earn on Air ticket of agent for website like easemytrip and makemytirp
4) commission earn from Recharge and bill payments and money transfer from Prepaid payment instruments like oxigen fino etc
5) Mobile phone repairing (done by other shop)